论文标题

通过高还原和模型驱动的采样的关节组件的减少订单模型

A Reduced Order Model for Joint Assemblies by Hyper-Reduction and Model-Driven Sampling

论文作者

Morsy, Ahmed Amr, Kast, Mariella, Tiso, Paolo

论文摘要

表现出摩擦非线性的连接组件的动态行为具有振幅依赖性耗散和刚度。为了开发用于预测性和设计目的的数值模拟,需要进行接触接口的宏观尺度高保真模型(HFM)。但是,此类HFM的高计算成本阻碍了模拟的可行性。为此,我们提出了一种模型驱动的方法,用于构建此类组件的超降低顺序模型。专注于稳态分析,我们使用多谐波平衡方法(MHBM)来制定频域中的运动方程。减少基础是通过解决与虚拟界面条件相对应的一组振动问题来构建的。随后,Galerkin投影减少了模型的顺序。尽管如此,接口的必要罚款代表了实现高速加速的瓶颈。因此,我们实施了适应性的能源保护权重和抽样(ECSW)技术(HR),从而为任意细度的网格提供了显着的加速。此功能尤其有利,因为在决定网格大小时,分析师通常会在准确性和计算成本之间遇到权衡取舍,其估计对于这种类型的问题特别具有挑战性。为了评估我们方法的准确性而无需诉诸HF解决方案,我们提出了一个错误指标,其阈值在我们的分析中已证明可靠。最后,该方法的准确性和效率通过两个案例研究证明。

The dynamic behavior of jointed assemblies exhibiting friction nonlinearities features amplitude-dependent dissipation and stiffness. To develop numerical simulations for predictive and design purposes, macro-scale High Fidelity Models (HFMs) of the contact interfaces are required. However, the high computational cost of such HFMs impedes the feasibility of the simulations. To this end, we propose a model-driven method for constructing hyper-reduced order models of such assemblies. Focusing on steady-state analysis, we use the Multi-Harmonic Balance Method (MHBM) to formulate the equations of motion in frequency domain. The reduction basis is constructed through solving a set of vibration problems corresponding to fictitious interface conditions. Subsequently, a Galerkin projection reduces the order of the model. Nonetheless, the necessary fine discretization of the interfaces represents a bottleneck for achieving high speedups. For this reason, we implement an adapted Energy Conserving Weighing and Sampling (ECSW) technique for Hyper Reduction (HR), thereby allowing significant speedups for meshes of arbitrary fineness. This feature is particularly advantageous since analysts typically encounter a trade-off between accuracy and computational cost when deciding on the mesh size, whose estimation is particularly challenging for problems of this type. To assess the accuracy of our method without resorting to the HF solution, we propose an error indicator with thresholds that have proven reliable in our analyses. Finally, the accuracy and efficiency of the method are demonstrated by two case studies.

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